<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <input type="checkbox" checked>
    <button disabled>搜索</button>
    <script>
        const inp = document.querySelector('input')
        inp.checked = false//或者true 一定是boolean类型

        const button = document.querySelector('button')
        button.disabled = true//或者false 一定是boolean类型
    </script>
</body>

</html>